Although I'm not sure if it's obscure enough for this thread... I'm fond of
Obscure (xD).
It's a survival horror from 2004. Similar to Resident Evil Code Veronica, it makes you explore a highschool filled with monsters and puzzle with a team of teenagers looking for their missing friend.
Each character has a special ability useful on either battle or exploration (Ashley does double-attacks, Josh can detect unpicked items, the bad boy can pinlock, Kenny runs faster than anyone, etc).
The has many lovable aspects...
the music eery yet mystifying, the scenarios are well done and some parts (like darkened windows) can be destroyed to get advantage against creatures, the story and characters are great and you can play with a friend in co-op.
I have yet to play the sequel, Obscure 2, but since I heard it sucks in many areas, I'm postponing it.
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Let's continue with another: Trauma Center (DS, 2005)
Half surgeon simulator (with some scify elements), half visual novel... a hard yet gratifying game.
I remember playing it at night, hidden under the covers so my parents wouldn't realize I wasn't sleeping in school nights.
The game had a sequel for DS, a remake for Wii and two sequels/spinoffs also for Wii (better graphics, worse controls).
Then Atlus killed the franchise, probably due to low sales
I wish they had at least tried to release a new entry for 3DS...
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Ok, a last one: Tzar for PC.
A Bulgarian RTS from 2000. Nice midi music and 2D graphics, plus historic or fictional campaigns with dubbed sections...
It's a nice game, although the gameplay isn't very balanced and has some bugs here and there...
Some guys recently created an online version for browsers with many QoL improvements, if you're interested on trying it
https://tza.red/